Adam Clarke's Bible Commentary Verse 6. Before the mercy-seat that is over the testimony] These words in the original are supposed to be a repetition, by mistake, of the preceding clause; the word tkrph happarocheth, the veil, being corrupted by interchanging two letters into trpkh haccapporeth, the mercy-seat; and this, as Dr. Kennicott observes, places the altar of incense before the mercy-seat, and consequently IN the holy of holies! Now this could not be, as the altar of incense was attended every day, and the holy of holies entered only once in the year. The five words which appear to be a repetition are wanting in twenty-six of Kennicott's and Deuteronomy Rossi's MSS., and in the Samaritan. The verse reads better without them, and is more consistent with the rest of the account.
Matthew Henry Commentary
Verses 1-10 - The altar of incense represented the Son of God in his human nature and the incense burned thereon typified his pleading for his people The continual intercession of Christ was represented by the dail burning of incense thereon, morning and evening. Once every year the blood of the atonement was to be applied to it, denoting that the intercession of Christ has all its virtue from his sufferings on earth and that we need no other sacrifice or intercessor but Christ alone.
Original Hebrew ונתתה5414 אתו853 לפני6440 הפרכת6532 אשׁר834 על5921 ארן727 העדת5715 לפני6440 הכפרת3727 אשׁר834 על5921 העדת5715 אשׁר834 אועד3259 לך שׁמה׃8033